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mode7: paramaterize the map
This commit is contained in:
Vince Weaver
parent
8e99e81bbd
commit
29eea6a627
@ -18,8 +18,7 @@ MODE7: mode7.o
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ld65 -o MODE7 mode7.o -C ./apple2_1000.inc
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mode7.o: mode7.s \
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flying.s fast_multiply.s \
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utils.s zp.inc sprites.inc
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fast_multiply.s utils.s zp.inc sprites.inc
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ca65 -o mode7.o mode7.s -l mode7.lst
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clean:
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63
mode7/island_lookup.s
Normal file
63
mode7/island_lookup.s
Normal file
@ -0,0 +1,63 @@
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;====================================
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; do a full lookup, takes much longer
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; used to be a separate function but we inlined it here
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;====================
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; lookup_map
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;====================
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; finds value in space_x.i,space_y.i
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; returns color in A
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; CLOBBERS: A,Y
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lda SPACEX_I ; 3
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sta spacex_label+1 ; self modifying code, LAST_SPACEX_I ; 4
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and #CONST_MAP_MASK_X ; wrap at 64 ; 2
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sta SPACEX_I ; store i patch out ; 3
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tay ; copy to Y for later ; 2
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lda SPACEY_I ; 3
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sta spacey_label+1 ; self modifying code, LAST_SPACEY_I ; 4
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and #CONST_MAP_MASK_Y ; wrap to 64x64 grid ; 2
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sta SPACEY_I ; 3
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asl ; 2
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asl ; 2
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asl ; multiply by 8 ; 2
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clc ; 2
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adc SPACEX_I ; add in X value ; 3
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; only valid if x<8 and y<8
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; SPACEX_I is also in y
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cpy #$8 ; 2
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;============
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; 39
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bcs @ocean_color ; bgt 8 ; 2nt/3
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ldy SPACEY_I ; 3
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cpy #$8 ; 2
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;=============
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; 7
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bcs @ocean_color ; bgt 8 ; 2nt/3
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tay ; 2
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lda flying_map,Y ; load from array ; 4
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bcc @update_cache ; 3
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;============
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; 11
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@ocean_color:
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and #$1f ; 2
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tay ; 2
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lda water_map,Y ; the color of the sea ; 4
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;===========
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; 8
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@update_cache:
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sta map_color_label+1 ; self-modifying ; 4
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;===========
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; 4
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; rts ; 6
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16
mode7/island_map.inc
Normal file
16
mode7/island_map.inc
Normal file
@ -0,0 +1,16 @@
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flying_map:
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.byte $22,$ff,$ff,$ff, $ff,$ff,$ff,$22
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.byte $dd,$cc,$cc,$88, $44,$44,$00,$dd
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.byte $dd,$cc,$cc,$cc, $88,$44,$44,$dd
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.byte $dd,$cc,$cc,$88, $44,$44,$44,$dd
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.byte $dd,$cc,$99,$99, $88,$44,$44,$dd
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.byte $dd,$cc,$99,$88, $44,$44,$44,$dd
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.byte $dd,$cc,$99,$99, $11,$44,$44,$dd
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.byte $22,$dd,$dd,$dd, $dd,$dd,$dd,$22
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water_map:
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.byte $22,$22,$22,$22, $22,$22,$22,$22
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.byte $ee,$22,$22,$22, $22,$22,$22,$22
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.byte $22,$22,$22,$22, $22,$22,$22,$22
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.byte $22,$22,$22,$22, $ee,$22,$22,$22
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BIN
mode7/mode7.dsk
BIN
mode7/mode7.dsk
Binary file not shown.
134
mode7/mode7.s
134
mode7/mode7.s
@ -29,6 +29,7 @@ CONST_LOWRES_HALF_F EQU $00
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jsr clear_screens ; clear top/bottom of page 0/1
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jsr set_gr_page0
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; Initialize the 2kB of multiply lookup tables
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jsr init_multiply_tables
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;===============
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@ -50,13 +51,13 @@ CONST_LOWRES_HALF_F EQU $00
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sta SPLASH_COUNT
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sta DISP_PAGE
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lda #1
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lda #1 ; slightly off North for better view of island
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sta ANGLE
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lda #2 ; initialize sky both pages
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sta DRAW_SKY
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lda #4 ; starts out at 4.5
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lda #4 ; starts out at 4.5 altitude
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sta SPACEZ_I
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lda #$80
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sta SPACEZ_F
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@ -961,74 +962,9 @@ screenx_loop:
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nomatch:
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;====================================
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; do a full lookup, takes much longer
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; used to be a separate function but we inlined it here
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; Get color to draw in A
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.include "island_lookup.s"
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;====================
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; lookup_map
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;====================
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; finds value in space_x.i,space_y.i
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; returns color in A
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; CLOBBERS: A,Y
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lda SPACEX_I ; 3
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sta spacex_label+1 ; self modifying code, LAST_SPACEX_I ; 4
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and #CONST_MAP_MASK_X ; wrap at 64 ; 2
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sta SPACEX_I ; store i patch out ; 3
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tay ; copy to Y for later ; 2
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lda SPACEY_I ; 3
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sta spacey_label+1 ; self modifying code, LAST_SPACEY_I ; 4
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and #CONST_MAP_MASK_Y ; wrap to 64x64 grid ; 2
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sta SPACEY_I ; 3
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asl ; 2
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asl ; 2
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asl ; multiply by 8 ; 2
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clc ; 2
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adc SPACEX_I ; add in X value ; 3
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; only valid if x<8 and y<8
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; SPACEX_I is also in y
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cpy #$8 ; 2
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;============
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; 39
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bcs ocean_color ; bgt 8 ; 2nt/3
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ldy SPACEY_I ; 3
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cpy #$8 ; 2
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;=============
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; 7
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bcs ocean_color ; bgt 8 ; 2nt/3
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tay ; 2
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lda flying_map,Y ; load from array ; 4
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bcc update_cache ; 3
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;============
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; 11
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ocean_color:
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and #$1f ; 2
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tay ; 2
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lda water_map,Y ; the color of the sea ; 4
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;===========
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; 8
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update_cache:
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sta map_color_label+1 ; self-modifying ; 4
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;===========
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; 4
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; rts ; 6
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; jsr lookup_map ; get color in A ; 6
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; ;============
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; 6
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match:
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mask_label:
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@ -1119,49 +1055,9 @@ done_screeny:
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; this is used to check if above water or grass
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; the high-performance per-pixel version has been inlined
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lookup_map:
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lda SPACEX_I ; 3
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and #CONST_MAP_MASK_X ; 2
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sta SPACEX_I ; 3
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tay ; 2
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lda SPACEY_I ; 3
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and #CONST_MAP_MASK_Y ; wrap to 64x64 grid ; 2
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sta SPACEY_I ; 3
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asl ; 2
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asl ; 2
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asl ; multiply by 8 ; 2
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clc ; 2
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adc SPACEX_I ; add in X value ; 3
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; only valid if x<8 and y<8
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; SPACEX_I is in y
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cpy #$8 ; 2
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;============
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; 31
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bcs ocean_color_outline ; bgt 8 ;^2nt/3
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ldy SPACEY_I ; 3
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cpy #$8 ; 2
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bcs ocean_color_outline ; bgt 8 ; 2nt/3
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tay ; 2
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lda flying_map,Y ; load from array ; 4
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bcc update_cache_outline ; 3
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ocean_color_outline:
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and #$1f ; 2
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tay ; 2
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lda water_map,Y ; the color of the sea ; 4
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update_cache_outline:
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.include "island_lookup.s"
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rts ; 6
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;=====================
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; All finished
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;=====================
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@ -1178,6 +1074,7 @@ exit:
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; Return to BASIC?
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; This most likely won't work, should probably reboot
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rts
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@ -1201,22 +1098,7 @@ gr_offsets:
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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flying_map:
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.byte $22,$ff,$ff,$ff, $ff,$ff,$ff,$22
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.byte $dd,$cc,$cc,$88, $44,$44,$00,$dd
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.byte $dd,$cc,$cc,$cc, $88,$44,$44,$dd
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.byte $dd,$cc,$cc,$88, $44,$44,$44,$dd
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.byte $dd,$cc,$99,$99, $88,$44,$44,$dd
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.byte $dd,$cc,$99,$88, $44,$44,$44,$dd
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.byte $dd,$cc,$99,$99, $11,$44,$44,$dd
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.byte $22,$dd,$dd,$dd, $dd,$dd,$dd,$22
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water_map:
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.byte $22,$22,$22,$22, $22,$22,$22,$22
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.byte $ee,$22,$22,$22, $22,$22,$22,$22
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.byte $22,$22,$22,$22, $22,$22,$22,$22
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.byte $22,$22,$22,$22, $ee,$22,$22,$22
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.include "island_map.inc"
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.include "fast_multiply.s"
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